Desktop: Prefer the Vulkan WGPU adapter on Linux

[timon-schelling]

No description provided.

[timon-schelling]

!build desktop (Run ID 27945901504)

[gemini-code-assist]

Code Review

This pull request refactors the WGPU context creation and adapter selection logic by introducing a builder pattern with selection support and sorting available adapters by priority. The feedback suggests improving robustness by falling back to other adapters if the preferred one fails to initialize, as well as refining the sorting logic to prioritize macOS/iOS (Metal) and to sort by device type before backend to ensure discrete GPUs are always preferred.

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[cubic-dev-ai]

3 issues found across 3 files

Confidence score: 2/5

• In node-graph/libraries/wgpu-executor/src/context.rs, the Linux adapter sort can rank Vulkan CPU adapters above non-Vulkan hardware GPUs, so default selection may fall back to software rendering with major performance regression. Rebalance the ranking to prefer hardware adapters first (then backend preference) before merging.
• In node-graph/libraries/wgpu-executor/src/context.rs, request_device failure on the first candidate currently short-circuits build() and can lead to a downstream .expect() panic, turning a recoverable driver/adapter issue into an app crash. Try the next sorted adapters and return a handled error path instead of panicking before merging.
• In desktop/wrapper/src/lib.rs, the public re-export of WgpuBackends appears unused in-repo, which is low risk but adds API surface and maintenance noise. Either remove it now or land it alongside its first consumer to keep the wrapper interface intentional.

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